Clutch for hoisting apparatus.



I E. B. PETRIB. GLUICH FOR HOISTING APPARATUS.

APPLICATION I'ILED DEQ. 18,1912. RENEWED JULY 22. 1914.

1,120,741 Patented Dec. 15, 1914.

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E. B. PETRIE. CLUTCH FOR HOISTING APPARATUS. APPLIUATION FILED DEO.18,1912. RENEWED JULY 22. 1914.

1,120,741. Patented Dec. 15,1914.

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si c i of Letters Patent Patented Dec. 15, 1914.

To aZZwhom it may concern: 1 y a Be it known that 1, E1vos B. PETRIE, of the city of New York, county of Kings, and State of New York, have invented a new and useful Improvement in Clutches for Hoisting Apparatus, of which the following is a full, clear, and exact description.

lifly invention relates to improvements in clutches for hoisting apparatus, and more especially for improvements in clutches adapted for heavy work, and especially for use in hoisting sunken vessels, and can be used to advantage in connection with apparatus such as described in my application for Letters Patent of the United States No. 727,151, filed October 22nd, 1912. k

The object of my present invention isto provide self acting clutches for engaging the heavy cables usedin hoisting sunken vessels, to arrangeso that the clutches will work automaticallyand alternately in con- 'ne'ction with the lifting jacks, so that one clutch will hold the cable while it is being raised and the other will engage-the cable and hold the load in its elevated position while thejacks go back for another lift, and

i so on. i I

My invention also relates to meansforreleasing both jackswhen it is necessary to free the cable entirely, as will behereinafter explained.

Another object of my invention is to make the apparatus as simple, strong, and reliable as possible. Y

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicatecorresponding parts in all the views.

Figure l is a sectional elevation with parts broken away, of the apparatus embodying my invention. 2 is a detail section at right angles to that shown in Fig.

1, and illustrating the link connection between the upper cross-head and the lower clutch blocks, and Fig. 3 is a detail illustrating a slight modification of the appa-' ratus.

As illustrated in my prior application above referred to, the apparatus is provided with lifting jacks which are usually hydraulic jacks, for the purpose of raising a load. These are represented by a pair "of jacks in Fig. 1, comprising the customary cylinder 11 and pistons 12. The cylinder rests upon a suitable support 10 and the pistons carry a cross head 13 on which is a framework or casing 14 in which are held so as to move in and out with relation to each other, the clutch blocks 15, which grip the hoisting cables 16. This is preferably arranged so as to move downward between the cylinders, as the drawing showsfand the clutch blocks are normally pressed down so ES PATENT orrion which turns in a suitable-threaded rib 19 forming a part of the frame or casir'ig. By:

means of the nut, the tension of the spring 17 can be regulated. The clutch blocks 15 are held on the ends of the cam arms 20 which are arranged in pairs, and the inner ends ofwh ch are rounded as shown at 21,

and fit in corresponding recesses in the blocks 15. The blocks '15 movefreely up and down, and theouter endsof the cam arms are pivoted as shown at 22 on the framework or;-casing 14L. It will be seen,

therefore, that when the pistons 12 are raised, the casing or framework 14: is raised with them, and this raises the pivots 22 and causes the inner ends of the cam arms to swing inward and downward so that the blocks 15"jare;movedinto positive engagement-withthe cable 16, so that when great pressure is applied to raise a heavy load, the same pressure is exerted on the cam arms, and the blocks lo are forced into such positive contact with the cable 16 that no slipping can possibly occur.

'On the baseplate 10 below the uppe clutch just describedfis a similar clutch which is shownin '1, but is arranged at right anglesfto the upper clutch just described. It will be seen, therefore, that when the water is withdrawn from the cylinder 11 to permit the pistons 12 to re- 'I have shown means for. connecting the lower clamping blocks 15 with the crosshead 13, so that the jacks may be set in copies of this patent may be obtained for operation and the lower blocks 15 forcibly pulled upward to release the cable; ""Obviously the lower blocks might be connected with any part of the apparatus which is raised by the pistons. I have shown a simple means in which the lower blocks are provided with ears 23 between which are piv-' oted links 241, these being, held in place by bolts 25. The upper ends of the links 24 can 'be connected with ears 26 on the under sideof the cross-head 13, and the links are connected to the ears-26 by bolts 27.

When the apparatus is used in its normal.

way for lifting, the bolts 27 are disconnected so that the clutches work alternately and independently as described, but in case it becomes necessary to release the lower as well as the upper clutch, the links 24 are connected to the cross-head as'described, wedges are placed between the upper clamping blocks 15 to prevent them from closing, and

the pistons 12 are then forced upward sufficiently to lift the lower blocks 15 out of engagement with the cable 16, in which case the cable can slide freely'through both the upper and lower clutches.

In Fig. 3 I have shown a slight modification in which a cam 20 is pivoted at 22 and substituted for an arm 20, but obviously the principle is-the same in either case. In building the apparatus it is well to have the blocks 15 slide on bolts 15 and close against the tension of strong springs 15*, as referred 2. An apparatus of the kind described comprising-jacks, a framework or support, connected with "and moved by the jacks, a clutch carried by the framework and adapted to automatically engage a cable, a second clutch arranged behind the first clutch and adapted to automatically engage a cable and hold it against its back draft, and an operative connection between the second clutch and the aforesaid framework, whereby the movement of the framework is transmitted to the clutch to release it.

3. A11 apparatus of the kind described comprising hoisting jacks, a framework or support carried by the jacks, a clutch actuated by the lifting of and operatively connected with the said framework or support and adapted to automatically engage a cable, a second clutch arranged behind the first clutch and having opposed gripping members adapted to automatically engage and hold a cable against its back draft, and a detachable connection between the gripping members of the second clutch and the aforesaid framework, whereby the lifting of the framework can be made to release the gripping members of the second clutch.

4. In an apparatus of the kind described, the combination with the jacks, the framework carried by the jacks, a clutch carried by the framework and adapted to automatically engage a cable when moved by the vframework, a second clutch arranged behind the first clutch and having opposite gripping members to automatically engage the cable against its back draft, and detachable links connecting the gripping members of the second clutch with the aforesaid framework.

ENOS B. PETRIE.

but. five cents each, by addressing the Commissioner of Patents,

Washington, 13.0. 

